106 DISEASES OF DOMESTICATED BIRDS 
fited by the eye injection since the solution passes into them from the 
eye. In the case of severe eye involvement it may be necessary to 
feed the fowl artifically because of the difficulty encountered by the 
bird in finding its food. The question of whether it is profitable to 
treat all cases rests with the individual owner. 
Since the pox tumors disappear in the natural course of the dis- 
ease, the value of medicinal agents in hastening this end is ques- 
tioned. Among the remedies that have been recommended are tinc- 
ture of iodine, an ointment of glycerine, vaseline or lard containing 
2 per cent of carbolic acid and 70 per cent alcohol. 
Prevention. In some instances infection is brought to a flock 
by new birds from infected flocks, or by exposure at shows. It is 
possible that infection is carried on the clothing of persons who have 
been among infected birds, or by materials on which the excretions 
of diseased birds have been deposited. Free flying birds may also 
serve as carriers although it is quite likely that they are rarely re- 
sponsible for outbreaks. Newly purchased fowls and those which 
have been exhibited at shows should be quarantined on their arrival 
for a period of two weeks and carefully examined before being set 
free among others. When a fowl is observed to be ill with symp- 
toms of diphtheria, it should be isolated immediately. Often it is 
good policy to destroy the patient because of the danger of the 
attendant who is treating the bird carrying the virus to healthy 
fowls. Those handling diseased fowls should disinfect their hands 
before feeding or caring for others. It would also be advisable to 
wear rubbers in the hospital and remove them on leaving in order 
to guard against carrying infection on the shoes. 
When infection has brcken out in a flock particular care should 
be exercised in keeping the houses as clean as possible. They should 
be disinfected by spraying or washing with carbolic acid in 5 per 
cent solution, compound cresol in 2 per cent solution, or formaldehyde 
in 2 per cent solution. The yards may be spread with unslaked lime 
or chloride of lime, or the soil should be plowed under. All birds 
that die should be burned or buried deep. Those which have re- 
covered, if retaining any evidence of the disease, should be destroyed, 
as certain ones may serve as carriers and furnish the source of a 
future outbreak. The drinking water may be medicated with per- 
manganate of potash. A sufficient amount of the latter should be 
employed to give the water a deep purple color. 
Immunization. An attack of the disease confers an immunity 
complete in from 12 days to 3 weeks but which varies in duration 
